Flexible mask strap



FIG. 1 is a front elevational view of a flexible mask strap showing mynew design, portion of the strap are shown broken away to indicateindeterminate length;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a left-side elevational thereof; and,

FIG. 7 is a top and front perspective view thereof showing the strapattached to a face mask, the broken lines are for illustrative purposesonly and form no part of the claimed design.

The ornamental design for a flexible mask strap, as shown and described.